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Mg-Al-Zn合金激光焊接头的耐蚀性研究

Investigation on Corrosion Resistance of Mg-Al-Zn Alloy Joint by Laser Beam Welding
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摘要 分别采用激光焊和激光填丝焊2种方法对4 mm厚的Mg-Al-Zn合金进行焊接,并对镁合金接头的腐蚀机理进行了探讨。采用极化曲线测量、电化学阻抗谱测试、SEM观察和EDS分析等方法,对获得的激光焊接头(LBW)和激光填丝焊接头(LBW-F)在3.5%NaCl溶液中的腐蚀行为进行研究,并与母材(BM)的耐蚀性进行对比,结果表明,腐蚀产物主要由Mg(OH)_(2)和碳酸盐组成,3种试样的耐蚀性由高至低为:LBW接头>LBW-F接头>BM母材。 The 4 mm thick Mg-Al-Zn alloy plate is welded by using laser beam welding(LBW)and laser beam welding with filler wire(LBW-F),respectively.The corrosion mechanism of the Mg-Al-Zn alloy joint is discussed.Some technical means involving polarization curve measurement,electrochemical impedance spectroscopy test,scanning electron microscopy(SEM)observation and energy dispersive spectroscopy(EDS)analysis are employed.The corrosion behavior of the LBW and LBW-F joints in the 3.5%NaCl aqueous solution is investigated,and is compared with that of the base metal(BM).Results show that the corrosion product is mainly composed of Mg(OH)_(2) and carbonate,and that the corrosion resistance relationship of the joints and BM can be expressed as LBW joint>LBW-F joint>BM.
作者 王少刚 韩弘利 曹梦艺 WANG Shaogang;HAN Hongli;CAO Mengyi(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处 《材料开发与应用》 CAS 2023年第5期15-23,共9页 Development and Application of Materials
基金 南京航空航天大学大学生创新训练计划项目(2023CX006054)。
关键词 Mg-Al-Zn合金 激光焊 激光填丝焊 电化学腐蚀 腐蚀机理 Mg-Al-Zn alloy laser beam welding laser beam welding with filler wire electrochemical corrosion corrosion mechanism
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